Functional Options
go语言的函数没有重载以及默认参数的功能，这个时候生成一个i对象会变得极其麻烦
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type Person struct{
Name string
Age int
Country string
Gender string
Height string
Address string
}
func main(){
person :=Person{
Name:"张三",
Age: -1，
Country: "China",
Gender: "Male",
Height: "-1",
Address: "unknown",
}
}
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我们可以使用函数式选项来解决这一问题。
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type Person struct {
Name string
Age int
Country string
Gender string
Height string
Address string
}
// 将func(*Person)这种类型的函数简化命名
type per func(*Person)
func Country(country string) per {
return func(person *Person) {
person.Country = country
}
}
func Gender(gender string) per{
return func(person *Person){
person.Gender = gender
}
}
func Gender(gender string) per{
return func(person *Person){
person.Gender = gender
}
}
func Address(address string) per{
return func(person *Person){
person.Address = address
}
}
// NewPerson ...
func NewPerson(name string,ops ...per) *Person {
person := &Person{
Name: name,
Age: -1,
Country: "China",
Gender: "Male",
Height: 0,
Address: "unknown",
}
for _,op:= range ops {
op(person)
}
return person
}
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用法：
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package main
import (
"fmt"
op "studygo/pattern/functionOptions"
)
// main ...
func main() {
person1 := op.NewPerson("zhangsan")
fmt.Println(person1)
person2 := op.NewPerson("Marry", op.Gender("Female"), op.Country("Japan"))
fmt.Println(person2)
}
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